Add WIP bumper-style case models

Fix typo - zcat

Add faster method for obtaining headers

README clarifications

Implement tap modifiers

Working symbols layer with shifting functionality as well

Fix modifier keys to report properly

README steps for usage & some cleanup

Use polling instead of interrupt to process events in ppbbq10_irq_handler

Make failure to acquire IRQ non-fatal

Disable backlight functionality

Write out data in single msg

Reference:
  - https://github.com/arturo182/bbq10pmod_module/issues/1
  - https://github.com/berkutta/bbq10pmod_module/commit/ae8c561bb67cddb4bc23ec2941374d2b6d58cec2

Stylistic updates - alphabetize fns/defs, func decls on nl, etc.

Rename to ppbbq10; use 3rd I2C adapter rather then using module device table

Delete map & dts file

Add README

Add backlight as its own device so it can be controlled over sysfs

Change the key mapping to a static array and add keymap

The keymap can be loaded using the `loadkeys` command.

Add support for new features in the chip SW

Mainly new CFG bits that make it easier to map the keys on Linux.

Changed the keymap to sparse, WIP

Initial import

Not quite working but it's something